[S] Interaction terms in plots of gam objects?

["Patrick Connolly" <P.Connolly@hort.cri.nz>]

If an interaction term is used in a gam, the plot of the interaction
term can at times obscure interesing information.  If plot.gam() could
be persuaded to do a contour plot instead, I could see what's
happening over the other side of the hill.  I can't make head nor tail
out of the code for plot.gam.  What part is recognising factors?

Thanks for suggestions.

Patrick


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